Impregnated wood and method of preparing the same.



strains inns a. .BAEKELAND, tar-reunites, new roan, assidnoa 'ro norsnson rnocnss i JEEPMSEY, A CORPORATION OF NEW JERSEY.

II EIIFEEGNATED can MEET-10D- O'Il' PREPARING THE EiAhIE.

- its strength and hardness and'to improve keeping and fire-resisting properties.

According to the inventionthe wood 151m pi'egna-ted,,nnd its pores charged with the dissalvednfatters of the waste liquor resulting from the preparation ofwood pulp by ma terials and more particularly mineral T colloidalv organic extractive matters and bodies having tanning properties and con tainsalst? calcium and other salts of complex.

oxysulfur acids. The products contained this liquor have an antiseptic action," and I possess the property of coagulating or renpresent in fresh wood.

dering. insoluble some of the albuminoids and other .putrescible com ounds ordinarily t the same time these various compounds, organic and inorganic, after drying in the wood, pores and in' or between the wood cells and fibers,

harden the wood, render it more resistant to pressure or breaking stresses, and permit it to receive and retain an improved finish.

In its simplest form, the invention may be practised by treating the wood with waste sulfite'liquor exclusively as by soaking the wood in the Waste liquor until the latter has penetrated to a sufficient extent, after which the wood is withdrawn and dried. Impregnation'may be improved or accelerated by any of the well known methods involving the use of boiling or vacuum or pressure as by boiling or heating under pressureQAs the sulfite liquor ordinarily possesses a sh htly acid reaction it is generallyadvisab fia to add an alkaline product, as for in.- stance lime or a soluble alkali or alkaline salt, as for instance sodium silicate. This promotes the antiseptic efi'ect. The liquor .lt atented Mar. 253, 1 9m 130?, Serial E50. i tigzzfii j ttenewed'dunc 11, item. Serial may lie-employed as. it flows from thedigesters, or'it may be concentrated by preliminary evaporation to form a thick liquid, v r

crystallization, oi -inorganic salts, and for thisreason considerably larger proportions of mineralfire-proofing or antiseptic salts may be used in conjunction with such extractive's, or with the liquor containing them,

efiorescenc'e orcrystallization of the salts or. of rendering, the product hygroscopic, from or in wood treated therewith and that-by ,usi-nglsuch'ilarger proportions of without liability of .pro'ducing-- ultimate saltsan improved prmiu'ct-isobtained. This effect is particularly noticeable with sodium silicate, (water'glafss) which when used alone-is aptto-giv'e'etiiorescence. The fireproofing-qualities' of the wood may be improved by the use in conjunction with.the

sulfiteliquor of soluble salts commonly em- -ployed-in fire-proofing, such for instance as salts: of aluminum,. the alali metals or amjmonium, soluble phosphates or tungstates,

GtUJfUITmlXtHIQS of these. added to the sulfite liquor or applied in solution to the wood before or after the treatment with sulfite liquor. In a similar manner zinc chlorid and other compounds having an antiseptic effect may be used. After the impregnation in any of the described ways is complete the wood is dried 'byany usual means.

In case the sulfite liquor is deficient in extractives or tanning agents, these may be adde'd in any desired proportion. In case it materials or color-producing materials may be added to the various described solutions.

These salts are liquor from the pulp digesters in the sulfite 7 process of making paper pulp, or the liquor in a concentrated form. a The terms are used in this sense in the present case. In the digestion of the wood, about half of the wood,

roughly speaking, remains behind as cellulose or paper pulp while the other half goes into solution, forming the sulfite liquor.

In this liquor most of the bisulfite of the original bisulfite solution has disappeared is desired tostain or dyethe wood, dyeing the characteristic colloidal dissolved bodies of sulfite liquor are frequently called, for the sake of a name, lignosulfonates. In addition to the lignosulfona-tes which are the constituents giving the liquor its tanning properties and power of acting on albuminoid materials, there are of course minor amounts of sugars, gums, etc., present, but

the characteristic and valuable bodies are these lignosulfonates.

In a Way, sulfite liquor may be said to be dissolved wood; and 1n impregnatin wood with it, the pores are thereby filled with material which does not materially alter the desirable physical characteristics and properties of the wood so impregnated.

I claim:

1. The method of treating, wood which comprises impregnating its pores with sulfite waste liquor.

2. The method of treating wood which comprises impregnating its pores with antiseptic compounds in conjunction with sulfite waste liquor.

3. T he method of treating wood which comprises impregnating its pores with mineral salts in conjunction with sulfite waste liquor.

4. As a new article of manufacture, wood having its pores impregnated with soli constituents of sulfite waste liquor.

5. As a new article of manufacture, woo having its pores impregnated with mineral salts and with the solid constituents of sulfite waste liquor.

6. As a new article of manufacture, wood having its pores impregnated with mineral salts and with the solid constituents of sulfite waste liquor and with dyeing or coloring materials.

7. The herein described method which comprises treating a fibro-cellular body with sulfite waste liquor under the action of heat and pressure.

8. The process of preserving wood which comprises impregnating its pores with waterglass and with the organic matters of sulfite waste liquor.

9. The method of treating wood which comprises impregnating it with material comprising the characteristic sulfur-containing colloid constituents of sulfite waste liquor.

10. As a new article of manufacture wood having its pores impregnated with a preserving material comprising the character istic sulfur-containing colloid bodies of sulfite waste liquor.

In testimony whereof, I affix my signature in presence of two witnesses.

LEO H. BAEKELAND.

Witnesses:

F ED'R. CASEY, MARY E. Scnonnme. 

